JP3358572B2 - Twist spinning method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the co-operation of a spinning nozzle for generating a swirling airflow on a sliver drafted by a drafting device and a twisting device comprising a pair of twisting rollers formed as hollow rubber rollers. The present invention relates to a twisting spinning method for twisting and spinning a spun yarn.

[0002]

2. Description of the Related Art Conventionally, a pair of twisted members formed by attaching a holding member holding a twisting roller formed as a hollow rubber roller to an output shaft of a motor, the output shaft of the motor intersects. At the same time, it is arranged so as to form a contact area in a large diameter area substantially at the center of the twisting roller,
A sliver is sandwiched in the contact area, and a twisting device configured to twist is used. By the cooperation of the twisting device and a spinning nozzle that generates a swirling airflow, twisting is performed to generate a spun yarn. Such a twisted spinning method is known.

[0003]

The twisting device is constructed so that a sliver is sandwiched between a pair of twisting rollers formed as hollow rubber rollers and twisted, so that a twisting roller made of rubber is used. However, wear will occur in the contact area where the sliver contacts. As the wear of the twisting roller progresses, the frictional force of the twisting roller decreases, and the twisting ability of the sliver by the pair of twisting rollers decreases. As described above, when the twisting ability of the sliver by the pair of twisting rollers is reduced, there is a problem that the strength of the spun yarn is reduced.

[0004] An object of the present invention is to solve the problems of the above-mentioned conventional twisting spinning method.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention firstly provides a twisted spinning method in which spinning is performed by a spinning nozzle and a twisting device. Is measured, and when the tension of the spun yarn reaches a predetermined lower limit, the twisting force of the twisting device is increased. Second, the twisting device comprises a pair of twisting devices. When the tension of the spun yarn reaches a predetermined lower limit, the number of rotations of the twisting roller is increased. Spinning is stopped when the number of revolutions reaches the upper limit. Fourth, the amount of increase in the number of revolutions of the twisting roller can be arbitrarily set. In a spinning machine having a twisting device consisting of a spinning nozzle and a pair of twisting rollers, When the tension of, but does not reach the predetermined lower limit value, which has passed the allowable operating time of twisting rollers,
Sixth, the number of rotations of the twisting roller is forcibly increased, and sixthly, in a spinning machine having a plurality of twisting devices including a spinning nozzle and a pair of twisting rollers, the yarn tension during spinning is reduced. At the time when the twisting device that has reached the predetermined lower limit and increased the rotation speed of the twisting roller has reached the predetermined ratio, the rotation speed of the twisting roller of another twisting device is also forcibly increased. Things.

[0006]

EXAMPLES Examples of the twisting spinning method of the present invention will be described below, but the present invention is not limited to these examples unless it exceeds the gist of the present invention.

First, an example of a twist spinning apparatus to which the twist spinning method of the present invention is applied will be described.

D is a four-wire draft device as an example, and is composed of a front roller 1, a second roller 2 having an apron 2 ', a third roller 3, and a back roller 4. N is the downstream side of the draft device D (the traveling direction of the sliver S, ie, in FIG. 1,
The left direction is referred to as the downstream side. ) Is a spinning nozzle that generates a swirling airflow, and T is a twisting device described later, which is disposed downstream immediately after the spinning nozzle N. 5
Is a delivery roller 5a that is disposed downstream of the twisting device T and is always driven to rotate.
and a nip roller 5b that can be brought into contact with and separated from the nip roller 5a.

Next, a pair of twisted members T 'having the same structure, which constitute the twisting device T, will be described.

Reference numeral 6 'denotes an output shaft of a suitable motor 6 such as a brushless motor. Reference numeral 7 denotes a pair of disk-shaped or cylindrical holding members attached to the output shaft 6 'at predetermined intervals, and reference numeral 8 denotes a twisted roller formed as a hollow rubber roller having openings at both ends. It is. Motor 6
By fitting the openings at both ends of the twisting roller 8 to the holding member 7 attached to the output shaft 6 ′ of the motor 6, the twisting roller 8 is connected to the output shaft 6 ′ of the motor 6 via the holding member 7. It is constituted so that it can be attached to.

[0011] A pair of twisted members T 'having the above structure
Are arranged such that the output shafts 6 ′ of the motor 6 intersect and the twisting roller 8 comes into contact with the large-diameter region substantially at the center. Then, the motor 6 is driven to rotate the twisting roller 8 attached to the output shaft 6 ′ via the holding member 7, and a sliver is formed in a contact area where the pair of rotating twisting rollers 8 contacts. Pinch,
The sliver is twisted by a twisting device T composed of a pair of twisted members T ′.

Hereinafter, a process of spinning a spun yarn by the twisting spinning apparatus having the above-described configuration will be briefly described.

The fibers constituting the sliver S drafted by the drafting device D are introduced through a spinning nozzle N into a twisting device T comprising a pair of twisting members T 'having twisting rollers 8 and sliver. Most of the fibers constituting S are twisted by the twisting action of the twisting device T between the twisting device T and the nip point of the front roller 1 and are bundled as core fibers. On the other hand, twisting device T
Accordingly, the remaining fibers that have not been twisted and do not constitute the core fiber are rotated around the core fiber by the spinning nozzle N that generates a swirling airflow that is opposite to the twisting direction of the twisting device T.
Wound as a wrapped fiber in the direction opposite to the twisting direction of the core fiber. After that, the twist given to the core fiber by the twisting device T starts untwisting when passing through the twisting device T. By the untwisting of the core fiber, around the core fiber,
The wrapped fiber that is wound in the opposite direction to the twisting direction of the core fiber is more strongly wrapped around the core fiber by untwisting in the same direction as the twisting direction of the wrapped fiber, and is untwisted and almost twisted. A kind of bound spun yarn Y in which the wound fiber is wound around the wound core fiber is produced.

Since the twisting roller 8 for sandwiching and twisting the sliver is formed of rubber having appropriate softness and elasticity, the surface thereof wears as the operation time elapses. When the twisting roller 8 is worn, the gripping force of the fibers constituting the sliver S by the pair of twisting rollers 8 is weakened, and the twisting ability of gripping and twisting the fibers constituting the sliver S is reduced. When the twisting ability for gripping and twisting the fibers constituting the sliver S is reduced, the yarn strength of the spun yarn Y to be spun is reduced.

It is known that when the twisting roller 8 is worn and the twisting ability is reduced, the yarn strength of the spun yarn Y decreases, and at the same time, the tension during spinning decreases. In the present embodiment, the spun yarn Y caused by wear of the twisting roller 8 is used.
Is detected by a tension detection device described later, and when the tension of the spun yarn Y detected by the tension detection device reaches a predetermined lower limit, via a central control unit described later,
The rotation speed of the twisting roller 8 is increased by a predetermined rotation speed. As described above, when the rotation speed of the twisting roller 8 is increased, the gripping force and the twisting ability of the twisting roller 8 are increased, and the spun yarn Y having a normal yarn strength is increased, and the tension during spinning is increased. .

In FIG. 1, reference numeral 9 denotes a tension detecting device disposed between the twisting device T and the yarn feeding device 5 including the above-described delivery roller 5a and nip roller 5b. And fixed guide rollers 9a and 9b arranged at predetermined intervals along the traveling direction of the vehicle, and a movable guide roller 9c movable in the vertical direction arranged between the fixed guide rollers 9a and 9b. ing.
10 calculates the tension of the spun yarn Y based on a signal from a position detection member 9d of a tension detection device 9 that detects the position of a movable guide roller 9c that moves up and down in response to a change in the tension of the spun yarn Y. When the tension of Y reaches a predetermined lower limit, a signal is sent to the drive control unit 11 of the motor 6 to increase the rotation speed of the motor 6, that is, the rotation speed of the twisting roller 8, by a predetermined rotation speed. And a central control unit configured to cause the

FIG. 3A shows an example of the tension detected by the tension detecting device 9 with the elapse of the operating time of the spun yarn Y twisted and spun by the new twisting roller 8. Fluctuations are shown. The tension of the spun yarn Y twisted by the new twisting roller 8 is maintained at a substantially predetermined tension f1 for a predetermined operation time, for example, until t1, but after t1, The tension of the spun yarn Y detected by the tension detecting device 9 gradually decreases. When the central controller 10 calculates that the tension of the spun yarn Y detected by the tension detector 9 has reached the predetermined lower limit value f2, the central controller 10 controls the drive controller of the motor 6 from the central controller 10. 11
As shown in FIG. 3B, the rotation speed of the motor 6, that is, the rotation speed of the twisting roller 8, is changed at the time t2 when the tension of the spun yarn Y reaches the lower limit value f2. The tension of the spun yarn Y is increased to the above-mentioned tension f1 by increasing the predetermined rotation speed r1. As described above, when the number of rotations of the twisting roller 8 is increased, the gripping force and twisting ability of the twisting roller 8 are increased, and a spun yarn Y having a desired strength can be spun.

As described above, at the time point t2 when the tension of the spun yarn Y reaches the lower limit value f2, the rotation speed of the twisting roller 8 is increased by the predetermined rotation speed r1, and the tension of the spun yarn Y is increased. When the spinning is continued after the tension is increased to the tension f1, as shown in FIG. 3A, at a time t3 when a predetermined operation time has elapsed, the spun yarn Y detected by the tension detecting device 9 is again detected. The tension reaches the predetermined lower limit f2. In this way, when the tension of the spun yarn Y reaches the predetermined lower limit f2 again, the central control unit 10
Sends a signal to the drive controller 11 of the motor 6,
As shown in (b), the rotation speed of the motor 6, that is, the rotation speed of the twisting roller 8, is increased by a predetermined rotation speed r2 at a time t3 when the tension of the spun yarn Y reaches the lower limit value f2. Then, the tension of the spun yarn Y is increased again to the tension f1. As described above, when the tension of the spun yarn Y reaches the predetermined lower limit value f2, the drive control unit 11 of the motor 6 is controlled via the central control unit 10, and the rotation speed of the twisting roller 8 is set to By increasing by a predetermined amount, twisting roller 8
, And the yarn strength of the spun yarn Y can be maintained at a desired value.

The central control unit 10 is provided with a rotation speed setting circuit that can appropriately set the amount of increase in the rotation speed of the twisting roller 8. It is configured such that the increment of the number can be adjusted. As described above, by increasing the number of rotations of the twisting roller 8 according to the type of the spun yarn Y and the type of the twisting roller 8, it is possible to appropriately perform various spinning operations. Can be.

Further, depending on the spinning conditions, the twisting roller 8 may be used.
Since the rotation speed of the twisting roller 8 reaches the upper limit, a stop signal transmitting circuit that sends a stop signal to stop the driving of the twisting spinning device to the twisting spinning device when the rotation speed of the twisting roller 8 reaches the upper limit is provided. , Central control unit 10. Twisted roller 8
When the rotation speed of the twisting spinning device reaches the upper limit, without stopping the drive of the twisting spinning device, simply turning on a lamp that informs the operator that the rotation speed of the twisting roller 8 has reached the upper limit, The lamp lighting circuit can be provided in the central control unit 10. Of course, the upper limit rotation speed of the twisting roller 8 is
It can be set as appropriate. As described above, when the rotation speed of the twisting roller 8 reaches the upper limit, automatically
Since the twisting device is stopped and the lamp is turned on to notify the operator, spinning can be performed only in the usable range of the twisting roller 8, and therefore, the generation of the spun yarn Y of inferior quality can be prevented. At the same time, the time for replacing the twisting roller 8 can be easily understood.

Hereinafter, as an example, a specific example will be described in which the tension fluctuation of the spun yarn Y decreases with the elapse of the operation time, and the rotation speed of the twisting roller 8 increases.

In the case of spinning a 36th spun yarn Y from a sliver S composed of 50% polyester and 50% cotton, the rotation speed of a new twisting roller 8 is set to 3200 rpm.
Assuming that the predetermined tension of the spun yarn Y is 30 grams, the tension of the spun yarn Y detected by the tension detecting device 9 slightly fluctuates around 30 grams until approximately seven days, After the day, the tension of the spun yarn Y gradually decreases as in the operation time t1 to t2, and on the approximately 14th day, the tension of the spun yarn Y decreases to 25 g, which is the lower limit f2. The tension of the spun yarn Y detected by the tension detecting device 9 is equal to the lower limit value f2.
When the central control unit 10 calculates that 25 g has been reached, a signal is sent from the central control unit 10 to the drive control unit 11 of the motor 6, and the rotation speed of the motor 6, that is, the twisting roller 8 The rotation speed of is increased by 200 rpm to 34
At 00 rpm, the tension of the spun yarn Y is increased to approximately 30 grams and spinning is continued.

The rotation speed of the twisting roller 8 is set to 200 rpm
When the operation is continued for approximately 10 days after increasing the speed to 3400 rpm, that is, at the operation time t3, the tension of the spun yarn Y detected by the tension detecting device 9 again reaches the lower limit value f2 of 25 grams. Therefore, a signal is sent from the central control unit 10 to the drive control unit 11 of the motor 6, and the number of revolutions of the motor 6, that is, the number of revolutions of the twisting roller 8 is further increased by 200 rpm to 3600 rpm to obtain a spun yarn. The spinning of Y is increased to approximately 30 grams and spinning is continued.

As described above, when the tension of the spun yarn Y detected by the tension detecting device 9 reaches the lower limit value f2 of 25 grams, the rotation speed of the motor 6, that is, the rotation of the twisting roller 8, By increasing the number by 200 rpm, the gripping force and twisting ability of the twisting roller 8 are increased, and the yarn strength of the spun yarn Y is maintained at a desired value. Then, the fact that the rotation speed of the twisting roller 8 has reached the upper limit, for example, 3800 rpm, is determined by a signal from a rotation speed detecting member disposed close to the output shaft 6 ′ of the motor 6, the twisting roller 8, and the like. When the central control unit 10 detects, the central control unit 1
The drive of the twisting spinning device is stopped by a signal from 0, and a lamp for informing the operator that the rotation speed of the twisting roller 8 has reached the upper limit is turned on.

The embodiment shown in FIG. 4 is similar to the embodiment shown in FIG.
As shown in the figure, although the tension of the spun yarn Y detected by the tension detecting device 9 has not reached the lower limit value f2,
When the allowable operating time of the new twisted roller 8 known experimentally or empirically has elapsed, the drive control of the motor 6 is controlled by the central control unit 10 at time t4 when the allowable operating time has elapsed. A signal is sent to the unit 11, and as shown in FIG. 4B, the rotation speed of the motor 6, that is, the rotation speed of the twisting roller 8 is increased by a predetermined rotation speed. . Further, when the operating time of the twisting roller 8 elapses a predetermined time from the time t4 when the rotation speed of the twisting roller 8 is increased by a predetermined rotation speed, the tension detecting device 9 is used.
Even if the tension of the spun yarn Y detected by the above does not reach the lower limit value f2, at this time t5, the central control unit 10
Then, a signal is sent to the drive control unit 11 of the motor 6 to forcibly increase the rotation speed of the twisting roller 8 by a predetermined rotation speed. With this configuration, even if a trouble occurs in the tension detecting device 9 or the like for some reason, the gripping force and the twisting ability of the twisting roller 8 can be increased, and the yarn strength of the spun yarn Y can be reduced to a desired value. Value can be maintained.

Further, as shown in FIG. 1, a drafting device D, a spinning nozzle N, a twisting device T, etc., and a winding device for winding the spun yarn Y are provided. As described above, when the yarn tension at the time of spinning of each spinning unit reaches a predetermined lower limit in a spinning machine in which a large number of spinning units are arranged side by side, the spinning units are arranged in each spinning unit. The number of rotations of the twisting roller 8 of the twisting device T is increased to increase the twisting capability of the twisting device T. In this way, the twisting device T of the spinning unit in which the yarn tension during spinning has reached the predetermined lower limit and the number of rotations of the twisting roller 8 has been increased is given a predetermined value with respect to the twisting device T of the entire spinning machine. (For example, when the number of rotations of the twisting roller 8 is increased in 80% of the total twisting devices T), the yarn tension during spinning has not reached a predetermined lower limit. The rotation number of the twisting roller 8 of the twisting device T of the remaining spinning unit may be simultaneously and forcibly increased. With such a configuration, even if a trouble occurs in the tension detecting device 9 or the like for some reason, the gripping force and the twisting ability of the twisting roller 8 can be increased,
The yarn strength of the spun yarn Y can be maintained at a desired value.

In the embodiment described above, an example is shown in which the number of revolutions of the twisting roller 8 is increased in order to increase the twisting force of the twisting device T. , The twisting force of the twisting device T can be increased. However, a mechanism or the like for bringing the twisting roller 8 closer in units of a few mm is required, and the twisting device T becomes complicated. Therefore, in the single-spindle drive method, increasing the rotation speed of the twisting roller 8 is the simplest method of increasing the twisting force.

It should be noted that the present invention is not limited to the tension detecting device 9 shown in the above-described embodiment, and various tension detecting devices 9 can be used.
Can be disposed between the spinning nozzle N and the twisting device T.

[0029]

Since the present invention is configured as described above, it has the following effects.

The tension of the spun yarn is measured, and when the tension of the spun yarn reaches a predetermined lower limit, the twisting force of the twisting device is increased. Physical properties and appearance can be maintained almost constant.

The tension of the spun yarn is measured, and when the tension of the spun yarn reaches a predetermined lower limit, the number of revolutions of the twisting roller is increased. The gripping force and twisting ability of the roller are enhanced, and therefore, the yarn properties such as the yarn strength and appearance of the spun yarn and the appearance can be maintained substantially constant.

Since the spinning is stopped when the number of rotations of the twisting roller reaches the upper limit, spinning can be performed only within the usable range of the twisting roller, and therefore, the production of spun yarn of inferior quality can be achieved. It can be prevented and the replacement time of the twisting roller can be easily understood.

Since the number of rotations of the twisting roller can be changed appropriately according to the type of spun yarn and the type of twisting roller, various and efficient spinning can be performed.

When the tension of the spun yarn has not reached the predetermined lower limit, but the allowable operating time of the twisting roller has elapsed,
Since the number of rotations of the twisting roller is forcibly increased, even if a trouble occurs in the tension detecting device or the like for any reason, the gripping force and the twisting ability of the twisting roller are increased, and the spun yarn is formed. The yarn strength can be maintained at a desired value.

When the yarn tension during spinning reaches a predetermined lower limit and the twisting device that has increased the rotation speed of the twisting roller reaches a predetermined ratio, the rotation speed of the twisting roller of another twisting device is reached. Therefore, even if a trouble occurs in the tension detecting device or the like for some reason, the gripping force and twisting ability of the twisting roller are increased, and the yarn strength of the spun yarn is increased. Value can be maintained.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a twist spinning apparatus as an example to which a twist spinning method of the present invention is applied.

FIG. 2 is a schematic perspective view of a twisted spinning apparatus as an example to which the twisted spinning method of the present invention is applied.

FIG. 3 is a graph showing a change in tension of a spun yarn and an increase in the number of rotations of a twisting roller with respect to an operation time.

FIG. 4 is a graph showing a variation in tension of a spun yarn and an increase in the number of rotations of a twisting roller with respect to the operation time.

[Explanation of symbols]

 D: Draft device N: Spinning nozzle T: Twisting device 8: Twisting roller 9: Tension detector

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2000-234224 (JP, A) JP-A-3-106378 (JP, U) JP-B-2-24929 (JP, B2) (58) Fields surveyed (Int.Cl. ⁷ , DB name) D01H 7/90 D01H 1/24

Claims (6)

(57) [Claims] In a twisting spinning method in which spinning is performed by a spinning nozzle and a twisting device, the tension of the spun yarn is measured, and when the tension of the spun yarn reaches a predetermined lower limit, the twisting device is rotated. A twisting spinning method characterized by increasing the twisting force of the spinning. 2. The twisting device comprises a pair of twisting rollers, and when the tension of the spun yarn reaches a predetermined lower limit, the number of rotations of the twisting roller is increased. The twisting spinning method according to claim 1, wherein: 3. The twisting spinning method according to claim 2, wherein the spinning is stopped when the number of rotations of the twisting roller reaches an upper limit. 4. The twisting spinning method according to claim 2, wherein the amount of increase in the number of rotations of the twisting roller can be arbitrarily set. 5. A spinning machine having a twisting device comprising a spinning nozzle and a pair of twisting rollers, wherein the tension of the spun yarn has not reached a predetermined lower limit, but the allowable operating time of the twisting roller has elapsed. Wherein the number of revolutions of the twisting roller is forcibly increased. 6. A spinning machine having a plurality of twisting devices each comprising a spinning nozzle and a pair of twisting rollers, wherein the yarn tension during spinning reaches a predetermined lower limit and the number of rotations of the twisting roller is increased. Wherein the number of revolutions of the twisting roller of another twisting device is forcibly increased at the time when a predetermined ratio is reached.